PHYSIOLOGY
GASTROINTESTINAL PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What happens in the small intestine?
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The food is stored; mixed with acid, mucus, and pepsin, and released at a constant and balanced rate into the duodenum.
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The fundus and upper portion of the gastric body relax to accommodate food.
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The intestinal contents are mixed with the secretions of the mucosal cells and with the pancreatic juice and bile.
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None of the above
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Explanation:
Detailed explanation-1: -Small regional contractions of the intestinal wall, known as segmentations, help to mix chyme with the digestive secretions in the duodenum and increase the rate of digestion. Segmentations also increase the contact of chyme with the mucosal cells to increase the absorption of nutrients through the intestinal wall.
Detailed explanation-2: -Exocrine cells in the mucosa of the small intestine secrete mucus, peptidase, sucrase, maltase, lactase, lipase, and enterokinase. Endocrine cells secrete cholecystokinin and secretin. The most important factor for regulating secretions in the small intestine is the presence of chyme.
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